Unemployed Antonio is elated when he finally finds work hanging posters around war-torn Rome. However on his first day, his bicycle—essential to his work—gets stolen. His job is doomed unless he can find the thief. With the help of his son, Antonio combs the city, becoming desperate for justice.

Antonio and Peppino live in a small town in central Italy: Peppino is the barber, Totò is maintained by the rich but avaricious wife Teresa.

During the winter of 1944, the partisans stationed in the Ligurian Apennines must go to a factory in Genoa, in order to pick up a delivery of weapons. Meanwhile, there's a strike in the city and the Nazis are trying to suppress it violently. The factory becomes the scene of fighting between the Germans and the partisans but the latter, aided by the workers, will be able to get the better.

After years spent working as a prostitute in her Italian village, middle-aged Mamma Roma has saved enough money to buy herself a fruit stand so that she can have a respectable middle-class life and reestablish contact with the 16-year-old son she abandoned when he was an infant. But her former pimp threatens to expose her sordid past, and her troubled son seems destined to fall into a life of crime and violence.

Two anarchistic brothers live by petty thievery and try to recover from their Catholic upbringing. Bandiera and Rabbino were children when they pushed their drunk of a father out of a window for killing their pet sheep. When a girl is raped by her father, she is brought by young "rescuers" to the home of the two brothers who then watch their friends take advantage of her sexually. The brothers take her in, and the three live happy and celibate if not uneventful lives until the brother's are sent to jail for stealing.

Four short films by four different directors dealing with the principles of modern life.

A bored civil servant accepts an invitation to visit a glamorous young lady. When she doesn't answer the door, then is later found murdered he panics!

A pretty woman approaching middle age rents out rooms in a small Italian town. An aging sailor and a handsome younger man are amongst the lodgers.

An Englishman has been working in the US so long he now speaks with an American accent. He is drafted into the British Army during WWII but is injured and loses his memory. Because he talks like an American, the doctors repatriate him to the States where he is housed with a New York family. After the war they all travel throughout Europe, searching for the women he still remembers in the hope of restoring his lost memory